Type-writing machine



(No Model.)

A. S. DENNIS. TYPE WRITING MACHINE.

No. 437,753. Patented Oct. '7. 1890.

UNITED STATES PATENT OFFICE.

ADOLPHUS S. DENNIS, OF MOINES, IOlVA.

TYPE-WRITING MACHINE.

SPECIFICATION forming part of Letters Patent No. 437,7 53, dated October 7, 1890.

Application filed January 21, 1890. Serial No. 337,662. (No model.)

.To aZZ whom it may concern:

Be it known that I, ADOLPHUS S. DENNIS, a citizen of the United States, residing at Des Moines, in the county of Polk and State of Iowa, have invented an Automatic Ribbon Moving and Reversing Mechanism for Type- VVriting Machines, of which the following is a specification.

My invention consists in the construction and combination of a trip device with a screw-threaded rotating shaft and ribbonholding spools, hereinafter set forth, pointed out in my claims, and illustrated in the accompanying drawings, in which- Figure 1 is a back view, and Fig. 2 a side view, of a machine, showing my invention applied as required for practical use. Fig. 3 is an enlarged sectional View through the line a 00 of Fig. 1.

A represents the frame of a type-writer machine that may vary in form and size.

B is a screw-threaded shaft in bearings attached to the frame A in such a manner that it can move longitudinally and rotate in reverse ways.

Nos. 1 and 2 are bevel gear-wheels fixed to the shaft 13.

C is a shaft that extends at right angles from the shaft B. It has a bevel-gear No. 3 on its end that alternately engages the wheels 1 and 2 as required to rotate the shaft B in reverse ways.

D is a case that incloses a spring for moving the carriage on the top of the frame A. The case is fixed to the shaft 0 and connected with the carriage by means of a belt F in a common way and in such a manner that power will be stored in the spring by the backward motion of the carriage.

G are ribbon-spools on shafts that have their bearings fixed to the frame A in such a manner that bevel-gears on their ends will engage corresponding bevel-gears on the ends of the shaft B, as shown in Fig. 2, so that the spools will be alternately rotated to wind a ribbon from one spool to the other as required to reverse the motion of the ribbon.

H is a straight bar that has downward extensions H at its ends. It is suspended from the top of the frame A by means of ahanger J in parallel position with the shaft B in such a manner that open slots in its downwardprojecting ends will be in line with the axis of the shaft.

K is a tripping duplex latch inthe form of a flat bar that has downward projections at its ends adapted to alternately enter annular grooves k in the shaft B. It is extended through the slots in the ends H and has notches k in its top edge that allow vertical motions, but prevent it from moving longitudinally.

L is a nut on the screw-threaded portion of the shaft B. It has a bifurcated stem m that serves as a fulcrum to support the tripping duplex latch 7t.

at are springs fixed to the bar H in such a manner that they will project downward inside of the ends H to be alternately engaged by the nut L as it travels back and forth on the shaft B. The power stored in the springs by the pressure of the nut will, when released, impart longitudinal motion to the shaft B. The under sides of the end portions of the duplex latch 70 are inclined planes that serve as cams, so that when the bifurcated stem m of the nut passes over those inclines alternately it will elevate the ends of the latch as required to lift the projections 70 from the grooves 70 in the shaft B, so that the force stored in the springs n will be released.

In the practical use of my invention the successive or intermittent forward motions of the carriage will rotate the spools G, and by means of the automatic trip devices the wheels Nos. 1 and 2 will be automatically and alternately brought into contact with the wheel No. 3 as required to alternately rotate the spools G in reverse ways to move the ribbon in reverse ways over the surface of the platen or roller against which the ribbon is pressed by the actions of the types as they are successively operated to print words upon paper placed between the inked ribbon and the platen.

I claim as my invention-- 1. A ribbon moving and reversing mechanism for type-writing, machines, comprising a screw-threaded rotating shaft that has annular grooves at the ends of the screw-threaded portion, a duplex latch having projections on its ends adapted to enter the grooves in the said shaft, a nut on the same shaft having a bifurcated stem adapted to support the said I to operate in the manner set forth.

2. The shaft B, having a screw-threaded section and annular grooves, bevel-gears Nos. 1 and 2 fixed to the shaft, a nut L, having a bifurcated stem m, a duplex latch k, having projections k, notches Zc in its top edge, and inclined planes on its lower edge and end portions, a bar or frame H, having slot-ted extensions H constructed, arranged, and combined with a rotating shaft 0, having a fixed gear-Wheel N0. 3, and two shafts that extend at right angles from the end of the shaft B, to operate in the manner set forth, for the purposes stated.

3. The bar or frame H, having slotted extensions H the duplex latch 70, having projections k and notches k, and the nut L, having a bifurcated stem m, in combination With a rotating and sliding shaft B, having a screw-threaded section and annular grooves 70, substantially as shown and described, for the purposes stated.

ADOLPHUS S. DENNIS.

Witnesses:

M. P. SMITH, THOMAS G. ORWIG. 

